Work rest and ejecting device for grinding machines



Oct. 16, 1928. 8 3

WORK REST AND EJECTING DEVICE-FOR'GRINDING MACHINES w. D. ARCHQEJAI Filed Jan. 18, 1924 mlrsa u Patented Oct. 16 1928 UNITED STATES PATENT OFFICE;

WALTER D. ARCHEA, F NORWOOD, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CINCINNATI GRINDERS INCORPORATED, 0F CINCINNATI, OHIO, A CORPORATION OF OHIO.

WORK BEST AND EJ ECTIN G DEVICE FOR GRINDING MACHINES.

Application filed January 18, 1924. Serial No 687,081.

This invention consists in a novel mechanism for supportingwork while being ground in a centerless grinding machine, and for ejecting or removing the work when ground to the predetermined point. v

The structure is primarily intended for use with that type of centerless grinders new extensively used, wherein two wheels, disks or elements are employed, one a grinding element and the other a governing or control element serving to effect or control, or effect and control, the rotation of the article or object ground. Machines of this general character are of two distinct types. In one the grindin and the governing elements take the form of disks, usually slightly raised toward the center or of flattened conoidal form, the work or object ground making contact with such side faces. In the other type the grinding and governing or control elements are arranged in common plane, or with their peripheries opposed. In both types the grinding wheel is caused to rotate about its axis at a relatively high speed and to move downward at the line of contact with the work, while the governing or control-wheel is caused to rotate about its axis at a relatively low speed and to move upward at its line of contact with the work. In both types of machines there is interposed between the grinding and the governing or control elements, a work-rest or support.

As these general features are common and well known, we have merely indicated the grinding and the governing elements without showing their spindles or arbors, bearings, driving pulleys and belts, since these are not necessary to a full understanding of the invention here set forth.

Precision grinding is best attained where the work or blank, cylindrical or tapering, has only rotary motion during the grinding operation, and the device here set forth is primarily intended for grinding under this condition, though not restricted thereto. For such grinding, the axial measurement of the governing and grinding wheels if peripherally opposed, or their efiective radii if facewise opposed, should be at least equal to the length of the body, or of any portion of the body, to be ground, so that any given portion may be ground without other than rotary movement of the blank, different sections being successively treated if there be more than one section requiring grinding. The drawings i1- lustrate such construction and proportioning. The device here-illustrated and described is designed as an attachment capable of ready application to and removal from grinding machines of the types above outlined, so that it may if desired be used interchangeably with the usual work-rest, guides, etc., with which such grinding machines are ordinarily equlpped, and Which are employed when it is desired to effect rotation and axial advance of the work during the grinding, through suitable adjustment of the grinding and the governing elements.

The preferred embodiment is illustrated in the accompanying drawings, in which:

Figure 1 is a perspective view of the complete device or attachment, the grinding and the governing elements being indicated by dotted lines; v

2, a front elevation of the device; and

Fig. 3, a transverse vertical-section on the line 3-3 of F ig- 2, looking in the direction of the arrows.

In these drawings the numeral 1 indicates a base or support which in practice is preferably the inner or forward end of a slide 2 mounted upon the top or bed-plate of the machine frame, and capable of movement in the direction of the arrows, Fig. 1. 3 indicates an upright standard which may conveniently be of the form shown in Fig. 1, its faces being recessed to permit the peripheries of the grinding element 4 and the governing element 5 to approach close to each other without encountering or contacting with said standard 3. In the form here shown the standard is provided with a lug or ear 6 to receive a tapbolt 7 which passes down through the ear 6 and enters a tapped hole 8 in the base 1, a second and similar fastening bolt 9 passing through the lower portion of the standard between its ends, the standard being recessed to lighten it and to permit the introduction of said bolt. To guard against any play or lateral movement of the supporting standard 3 relatively to the base or support 1, a rib- 10 is advisably formed upon the lower face of said standard, to enter and snugly fit a groove 11 formed in the upper face of the base-plate 1.

The standard 3 has in its upper face a groove or slot 12 to receive a bearing-plate, blade or bar 13 which is here shown as formed with a beveled upper edge constituting the immediate work-rest, or the portion thereof with which the work directly contacts when in grinding position. This work-rest or support is positioned between the opposed peripheral faces of the grinding and the governing elements 4 and 5, as indicated in Fig. 3, and may be nicely adjusted with reference to said elements by movement of the slide 2 forward or backward upon the top-plate orbed of the grinding machine, as is well understood, and when in place between the grinding and governing elements they prevent the work upon the rest or support 13 from rolling off the same. Suitable clamping means are provided for firmly securing the work-rest blade or bar 13 in its seat in the standard 3, tap screws 14; being here shown for that purpose, though any equivalent means may be employed.

Projecting from one end of the standard 3 and here shown as made fast to an upwardlyextending arm 15 of said standard, is a supporting and guiding arm 16 recessed to form a guideway for a sliding block 17 secured upon a rod 18 passing through guideways in the ends of arm 16, as indicated in Figs. 1 and 2. The rod 18 carries at its inner end a head or bunter 19, the lower end of which is preferably beveled to conform more or less nearly to the inclination or bevel of the upper face of the 'work-rest bar 13, the bunter moving lengthwise of and directly over the upper face )f said work-rest. When the rod 18 and block 17 are in their outermost posit-ion, as indicated in Figs. 1 and 2, the head or bunter 19 stands clear of or beyond the supporting face of the work-rest 13, so that the entire working face of the grinding and governing wheels may, in case the work be of a length to reach entirely across the same, contact with such work. The block 17 ismade fast to rod 18 by a set-screw 20 so that it may be adjusted upon said rod and set at any desired point, according-to the range of movement which it is desired to give to the bunter.

For the purpose of longitudinally reciprocating rod 18 and moving bunter 19 over work-restor support 13 and returning it to position, there is provided a lever 21 fulcrumed at a point between its ends upon a pivot-pin 22 passing through lugs or ears 23 projecting from one end of the standard 3,-

the upper end of lever 21 being slotted as indicated in Fig. 2, to receive a cross-pm 24 carried by block 17 so that upon oscillation of said lever about its pivot pin said block shall be moved forward and back. To oscillate lever 21 there is provided a longitudinally reciprocable rod 25, passing through, supported, and guided by lugs 26 proj ecting from standard 3, said rod being provided at one end with a radial arm 27 the outer end of which enters a slot or elongated o ening in the lower end of levr 21, and upon reciprocation of rod 25 swings said lever about its fulcrum. The outer end of rod 25, that is to say, the end which projects on the side of the machine at which the attendant or operator stands, is

furnished with a knob or head 28 to be pressed by the hand of the operator when it is desired to actuate the bunter and eject the finished work from the machine.

To return the parts to their normal positions, or in other words, to retract the bunter 19 and hold it in retracted position, a spring 29 conveniently made of helical formand arranged to encircle rod 25, is provided. This spring bears at one end against one of the lugs 26 and at its opposite end against an abutment 30, which may be a washer bearing against a through-pin 31, a shoulder, or any equivalent abutment.

The operation of the device may be briefly stated. In practice, one of the elements 4 or 5, preferably the governing or control-wheel 5, which at the time of introducing the work 32 is moved away from the companion or grinding element 4 to permit free insertion of the wor is moved inward toward the companion element until it makes contact with and presses the work into contact with the second element. As the governing or controlwheel makes contact with the work its starts the same rotating about its axis, and at a surface speed approximately the same as that of the governing element, and this speed is maintained absolutely or approximately as the wheels are approached and the grinding wheel begins its grinding operation, because the slower-moving body, which is usually of the same character or texture as that of the fastermoving grinding element, takes the stronger hold upon the work and dominates in controlling the rotation thereof, whereas the swiftlymoving grinding wheel cuts away the circumcompletely free the work, the'operator or attendant pushes upon the knob 28, actuates the bunter 19 through the intermediate connections, forcing the same longitudinally over the supporting face of the work-rest 13, and ejecting the work clear of the machine. The knob 28 being-released, the parts of the ejecting device are restored to normal position by expansion of the spring 29, the inward movement of the adjustable element of the grinding and governing couple is begun, and the cycle of operations above outlined is repeated so long as the grinding of blanks or objects is desired.

It is to be understood that this device.consti- I tutes a complete and self-contained attachment for centerless grinding machines of both the types hereinbefore referred to, that is to say, Whether employing peripherally-opposed or side-faceopposed grinding wheels or disks. It is, however, specially designed and intended for use with centerless grinders employing two separate rotating elements which simultaneously act upon opposite sides of the whole or of some longitudinal portion of the object ground, but which when provided with the ejector mechanism here described, are not set or adjusted to effect axial feed during the grinding of the object.

If the object to be ground is of a length less than the width of the grinding face of the grinding element, the bunter head may be moved to a point over the work-rest at which it will arrest the leading end of the obj ect at the proper point, on its introduction into the machine, and the adjustab-ility of the block 117 permits this adj ustment to be made.

It will be observed that the entire ejecting mechanism is carried by the standard 3 and has no direct or immediate connection with the work-supporting bar 13, hence said bar may be adjusted, removed, returned to place, or replaced by another of dilf-erent dimensions, without in any manner disturbing the ejecting mechanism. The ejector thus remains in the position to which it is adjusted preparatory to the grinding of a piece of special form or dimensions, but permits the ready change or adjustment of the work support without disturbing the ejector.

I claim: I

1. The herein described attachment for grinding machines, comprising a standard 3; a work-rest 13 carried thereby, a guide-- way 16 also carried by said standard; a rod 18 supported and guided in said guideway and provided with a head or bunter a block 17 carried by and adjustable upon the rod 18; a lever 21 fulcrumed in a supportcarried by the standard and having elongated openings at its ends; an actiiating iod 25 carried and guided in supports upon the standard; a laterally-projecting arm 27 carried by one end of the actuating-rod and eXtend ing into the opening in one end of lever 21; a pin 24 carried by block 17 and seated in the opening in the opposite end of said lever; and a spring 29 serving to move rod 25 in an outward direction, and to restore the parts to their normal position after manual movenent of said rod inwardly and release there- 0 2. In combination with grinding and control elements movable in opposite directions relatively to the intervening work-receiving throat; a standard located intermediate said elements; a work-supporting bar carried bysaid standard; a reciprocable rod mounted in a guideway carried by said standard; a bunter carried by said rod, movable over and in proximity to the work-supporting face of said bar; a manually-operable hunter-actuating rod longitudinally movable in guides on the standard; and a lever connecting the bunter rod and the actuating rod and serving, when the latter is moved in the proper direction, to effect a Work-ejecting movement of the former.

3. In combination with grinding and control elements movable in opposite directions relatively to the intervening work-receiving throat; a standard located intermediate said elements; a work-receiving bar carried by said standard; a guide arm secured to said standard; a reciprocable rod mounted in said guide arm and carrying a hunter movable over and in proximity to the work-supporting face of said bar; a manually operable actuating-rod longitudinally movable in guides on the standard; and a lever connecting the bunter rod and the actuating rod and serving, when the latter is moved in the proper direction, to effect a Work-ejecting movement of the former.

4. In combination with grinding and control elements movable in opposite directions relatively to the intervening work-receiving throat; a standard located intermediate said elements; a worlesupporting bar carried by said standard; a guide arm carried-by said standard; a rod supported in and movable through said guide arm and carrying a hunter arranged to move over and in proximity to the work-supporting face of said bar; a manually operable actuating rod guided and movable in supports carried by the standard and provided atvits inner end with a laterally projecting arm; a lever fulcrumed in the standard and connected at opposite ends with said radial arm and with the hunter-actuating rod respectively; and a spring serving to hold the hunter in its retracted position, whereby the hunter serves as an abutment for the object being ground, and upon axial movement of the actuating rod in one direction, effects removal of said object from the work-supporting bar, the spring serving to return the parts to normal position.

5. The combination with a centerless grinder including opposed grinding and regulating wheels and an intermediate workrest, of work-controlling means therefor comprising a bunter member movable over the rest in the throat between said wheels for ejection of work piece supported by the rest; means for positively actuating the hunter to eject a work piece; means for resiliently actuating the hunter into retracted position; and means for positively limiting the retracting movement of the hunter whereby the same will form a definite work-limiting stop.

6. The combination with a centerless grinder including opposed grinding and regulating wheels and an intermediate work-rest, of work-controlling means therefor comprismg a hunter member movable over the rest IOU in the throat between said wheels for ejec tion of work piece supported by the rest; means for positively actuating the bunter to eject a Work piece; means for resiliently actuating the hunter into retracted position; means for positively limiting the retracting movement of the hunter whereby the same will form a definite work-limiting stop; and means for adjustably'connecting the hunter and actuatingmechanism therefor, to vary the retracted work-limiting position thereof.

7. The combination with a centerless grinder including opposed grinding and regulating wheels and an intermediate work-rest, of a work-controlling mechanism for cooperation therewith comprising a bunter member alined with the throat between grinding and regulating wheels, and movable over the work-rest for ejecting a Work piece on the rest from the grinding throat; a shiftable member engaging the hunter; means for positively limiting the movement of the shiftable member into retracted position; means for adjustably connecting the hunter and member to vary the limit of movement of the hunter to provide a work-limiting stop; and means for jointly shifting the member and bunter for ejection of a Work piece.

8. A combined positioning stop and ejector for grinding machines, comprising a standard; a work-support carried by said standard; a guide arm secured to said stand ard and having a guideway; a block movable along said guideway and held thereby against lateral movement; a rod extending through said block and guideway; means for adj ustably securing the rod to said block; a hunter carried by one end of the rod and movable over the work-support; means for automatically moving said block, together with the rod and bunter, in one direction, and holding the block at one end of its guideway; and

manually operable means for moving said block, rod, and bunter in the opposite direction to carry the Work longitudinally off the work-support and beyond the grinding elements, the hunter serving by its adjustment relative to-the block, to determine the position of the inner end of the work when in grinding position on the Work-support.

9. The herein-described Work-positioning and ejecting device for grinding machines, comprising a standard; a work-support carried by said standard; a guide arm carried by the standard and having a guideway; a block movable along the guideway and prevented thereby from lateral movement relative to said guideway; a rod adj ustably mounted in said block and provided at one end with a hunter positioned to move over and in .alinement with the work-support; means for securing said rod at any desired adjustment relative to said block, whereby the position of the hunter relative to the Work-support and work may be determined; a lever connected at one end with said block and provided with an actuating rod; and a spring serving to hold the block normally at the end of its guideway remote from the work-rest, and to hold the actuating rod in position for actuating the ejector and moving the hunter longitudinally over the Work-support.

\10. The herein-described work-positioning and ejecting device for grinding machines, comprising a standard; a work-support carried by said standard; a guide arm carried by the standard and having a guideway; a block movable along said guideway and held against lateral movement relative thereto; a rod extending through the block and guide arm, and provided at one end with a hunter positioned to move over and in alinement with the work-support; means for holding said block normally at the limit of its movement away from the work-support; and means for'moving said block, rod and bunter longitudinally over the work-support in a directionto-eject the work therefrom and clear of the grinding and governing elements.

In testimony whereof I have signed my name to this specification.

WALTER 1). AROHEA. 

